Rework compositor touch hit testing

Source/core/rendering/RenderBoxModelObject.cpp

Index: Source/core/rendering/RenderBoxModelObject.cpp
diff --git a/Source/core/rendering/RenderBoxModelObject.cpp b/Source/core/rendering/RenderBoxModelObject.cpp
index 491343b86bab68ec11e4be88e43f22f747aec046..3b535642f9ca6dc883e6bc424f235bcd03a0da01 100644
--- a/Source/core/rendering/RenderBoxModelObject.cpp
+++ b/Source/core/rendering/RenderBoxModelObject.cpp
@@ -2554,6 +2554,16 @@ void RenderBoxModelObject::setContinuation(RenderBoxModelObject* continuation)
     }
 }
 
+void RenderBoxModelObject::computeLayerHitTestRects(LayerHitTestRects& rects) const
+{
+    RenderLayerModelObject::computeLayerHitTestRects(rects);
+
+    // If there is a continuation of this root node, then it won't otherwise
+    // be picked up by the tree walk, so we need to consult it here too.
+    if (continuation())
+        continuation()->computeLayerHitTestRects(rects);
+}
+
 RenderObject* RenderBoxModelObject::firstLetterRemainingText() const
 {
     if (!firstLetterRemainingTextMap)